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LCD Flicker / Display Freeze


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#1 mf0706

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Posted 03 October 2011 - 02:30 PM

I bought a refurbished laptop (hp 6930p elite) from an ebay seller last month. The laptop has been having display problems. I first noticed occasional LCD flickering. It can be temporarily resolved by adjusting the angle of the laptop screen, but the flickering always comes back later.

I contacted the seller, and they said I could take off the front bezel and check the connections to the lcd without voiding the 90-day warranty they offered. I reset the connection between lcd and the inverter, but it didn't help.

Since then I've also noticed occasional display freezing as well. Ie, programs still run, but the entire display stops or skips for a second or two. The problems (flicker and freeze) are most prevalent when I'm actually holding the laptop in my lap... I guess because it is a hardware problem that is disturbed by small movements?

Both the seller and I are trying to avoid me having to ship the laptop back to them for replacement or repair. (Costs them $ and leaves me without a laptop for a while) They've offered to send me a new inverter, but I don't know enough about laptop display mechanisms to be confident that the inverter is really the problem.

Just wanted to get some feedback or a second opinion on what could be causing intermittent lcd flicker and total display freezing.

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#2 ngм

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Posted 03 October 2011 - 09:50 PM

This is very normal assuming you do not have it plugged in. Laptop lcd screens tend to 'dim' to save power when they are not plugged in. Sometimes while dimming (or going through its cycle) they will flicker.
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#3 mf0706

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Posted 03 October 2011 - 10:59 PM

This is very normal assuming you do not have it plugged in. Laptop lcd screens tend to 'dim' to save power when they are not plugged in. Sometimes while dimming (or going through its cycle) they will flicker.


Thanks for the reply.

To clarify: The flickering occurs whether or not the laptop is plugged in and is accompanied by occasional skipping or freezing of the entire display. The flickering is most often localized to the bottom inch or bottom half of the screen, and the flickering portion goes much darker than when the backlight dims to save power.

#4 ngм

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Posted 03 October 2011 - 11:11 PM

Hmm... what kind of video card do you have? RAM?
Nosce te ipsum.

#5 mf0706

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Posted 04 October 2011 - 07:16 PM

Hmm... what kind of video card do you have? RAM?


Video card: ATI Mobility Radeon HD 3450
2GB RAM

That said, I've connected the laptop to an external monitor and there was no flickering or freezing, so I think I've counted out video card issues already.

Edit: Just realized I've been saying "LCD flicker" when I should be specifying that I think the flickering is just in the LED backlight (ie: flickering appears are dark horizontal bars on screen but very faint image is still visible in darkened sections)

Edited by mf0706, 04 October 2011 - 09:38 PM.


#6 ngм

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Posted 05 October 2011 - 12:33 AM

Okay, that being said-- I'd say you need a new monitor for your laptop. Take in.
Nosce te ipsum.

#7 mf0706

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Posted 05 October 2011 - 01:00 AM

Okay, that being said-- I'd say you need a new monitor for your laptop. Take in.


I was worried that would be the case, but I'm glad to have the clarification.
Thanks for your help!

#8 ngм

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Posted 05 October 2011 - 01:22 AM

Yeah, I understand, it is aggravating. And you're welcome!
Nosce te ipsum.




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